Microstructures and mechanical properties of Ni-coated SiC particles reinforced AZ61 alloy composites  

镀镍SiC颗粒增强AZ61镁合金复合材料的显微组织和力学性能（英文）

作　　者：Su-qing GUO Ri-chu WANG Chao-qun PENG Zhi-yong CAI Cui-ge DONG 郭苏庆;王日初;彭超群;蔡志勇;董翠鸽(中南大学材料科学与工程学院)

机构地区：[1]School of Materials Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第9期1854-1863,共10页中国有色金属学报（英文版）

基　　金：Project(CXZZ20140506150310438)support by the Science and Technology Program of Shenzhen,China;Project(2017GK2261)supported by the Science and Technology Program of Hunan,China;Project(2017zzts111)supported by the Fundamental Research Funds for the Central Universities of Central South University,China

摘　　要：In order to improve the interface bonding of SiCp/AZ61 composites prepared by powder metallurgy followed by hot extrusion, the electroless plating of Ni-P coating on SiCp was carried out. The influence of Ni coating on microstructure and mechanical properties of the composites was analyzed. The results show that SiC particles distribute more uniformly in the composites after surface Ni plating and there are fewer defects in Ni-coated composite. The Ni coating reacts with the magnesium matrix forming the Mg2Ni interfacial compound layer during the sintering process. The relative density of the composite increases from 97.9% to 98.4% compared with uncoated one and the hardness of the Ni-coated composite increases more rapidly as the volume fraction of SiCp increases. The tensile test results show that the tensile strength increases from 320 to 336 MPa when the volume friction of SiC particle is 9% and the Ni-coated composites have larger elongation, indicating that Ni coating improves the interfacial bonding strength and the performance of the composites. In addition, the fracture properties of SiCp/AZ61 composites were analyzed.采用粉末冶金加热挤压工艺制备SiCp/AZ61复合材料,为了改善复合材料的界面结合性能,在SiCp表面化学镀覆镍-磷涂层。分析镍涂层对复合材料显微组织和力学性能的影响。结果表明,SiC颗粒表面镀镍后在复合材料中分布更均匀,镀镍复合材料缺陷较少。在烧结过程中镍涂层与镁基体反应形成Mg2Ni界面化合层。与未镀覆复合材料相比,镀镍复合材料的致密度从97.9%增加到98.4%,并且随着SiC颗粒体积分数的增加,镀镍复合材料的硬度增加得更快。拉伸实验结果表明,当SiC颗粒的体积分数为9%时,镀镍复合材料具有较高的伸长率,拉伸强度从320MPa增加到336MPa,表明镍涂层能提高界面结合强度和性能。此外,分析SiCp/AZ61复合材料的断口形貌。

关 键 词：AZ61 matrix composites Ni-coated SiCp interface bonding mechanical properties surface modification 

分 类 号：TB3[一般工业技术—材料科学与工程]